mmc: at91_mci: show timeouts

Detect command timeout (or mci controller hangs).

Signed-off-by: Marc Pignat <marc.pignat@hevs.ch>
Signed-off-by: Hans J Koch <hjk@linutronix.de>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

1 files changed, 33 insertions, 2 deletions

diff --git a/drivers/mmc/host/at91_mci.c b/drivers/mmc/host/at91_mci.c
index e40340f32e35..fce171c7c67e 100644
--- a/drivers/mmc/host/at91_mci.c
+++ b/drivers/mmc/host/at91_mci.c
@@ -125,8 +125,33 @@ struct at91mci_host
 
         /* Latest in the scatterlist that has been enabled for transfer */
         int transfer_index;
+
+        /* Timer for timeouts */
+        struct timer_list timer;
 };
 
+static void at91_timeout_timer(unsigned long data)
+{
+        struct at91mci_host *host;
+
+        host = (struct at91mci_host *)data;
+
+        if (host->request) {
+                dev_err(host->mmc->parent, "Timeout waiting end of packet\n");
+
+                if (host->cmd && host->cmd->data) {
+                        host->cmd->data->error = -ETIMEDOUT;
+                } else {
+                        if (host->cmd)
+                                host->cmd->error = -ETIMEDOUT;
+                        else
+                                host->request->cmd->error = -ETIMEDOUT;
+                }
+
+                mmc_request_done(host->mmc, host->request);
+        }
+}
+
 /*
  * Copy from sg to a dma block - used for transfers
  */
@@ -557,9 +582,10 @@ static void at91_mci_process_next(struct at91mci_host *host)
         else if ((!(host->flags & FL_SENT_STOP)) && host->request->stop) {
                 host->flags |= FL_SENT_STOP;
                 at91_mci_send_command(host, host->request->stop);
-        }
-        else
+        } else {
+                del_timer(&host->timer);
                 mmc_request_done(host->mmc, host->request);
+        }
 }
 
 /*
@@ -618,6 +644,8 @@ static void at91_mci_request(struct mmc_host *mmc, struct mmc_request *mrq)
         host->request = mrq;
         host->flags = 0;
 
+        mod_timer(&host->timer, jiffies +  HZ);
+
         at91_mci_process_next(host);
 }
 
@@ -936,6 +964,8 @@ static int __init at91_mci_probe(struct platform_device *pdev)
 
         mmc_add_host(mmc);
 
+        setup_timer(&host->timer, at91_timeout_timer, (unsigned long)host);
+
         /*
          * monitor card insertion/removal if we can
          */
@@ -996,6 +1026,7 @@ static int __exit at91_mci_remove(struct platform_device *pdev)
         }
 
         at91_mci_disable(host);
+        del_timer_sync(&host->timer);
         mmc_remove_host(mmc);
         free_irq(host->irq, host);